Electrically-driven rotary pump



July 1933- J. w. w. DRYSDALE El AL 1,919,097

ELECTRICALLY DRIVEN ROTARY PUMP Filed July 30, 1931 7"SheetsSheet 1 JohnW W Drysdnle 9 John Young Z iZMWCIi/yim Aitorney Invehinm July 18, 1933.

J. w. w. DRYSDALE ET AL 1,919,097 ELECTRICALLY DRIVEN ROTARY PUMP Filed July 30, 1951 7 Sheets-Sheet 2 Invrdmrs J'ohnWWDrySdole V JOM Young 38 MLZAMWCLJFW Ail arms;

July 18, 1933.

J. w. w. DRYSDALE El AL 1,919,097

ELECTRICALLY DRIVEN ROTARY PUMP Filed July 30, 1931 7 Sheets-Sheet 3 Inventor: J'oMWWDrysdala dJohn Young LrlQLa/m 0131m Aubr'rwy y 1933- J. w. w. DRYSDALE ET AL 1,919,097

ELECTRICALLY DRIVEN ROTARY PUMP 7 Sheets-Sheet 4 k E E I f l l 1 70.6 f 1 1 l 1 x l 1 JohnWWDr'ysdale w John Young Aiturnm y 1933- J. w. w. DRYSDALE mm. 1,919,097

ELECTRICALLY DRIVEN ROTARY PUHP Filed July 50 1931 7 Sheets-Sheet 5 Irwmi'ory JolznWW .n ysdole flyjohn Ybury 3y C. M11;

y 1933- J. w. w. DRYSDALE ET AL 1,919,097

ELECTRICALLY DRIVEN ROTARY PUMP Filed July 30, 1931 7 Sheets-Sheet 6 Dweniors JohnWW Drysdale d JohnYoung Attorney J 1y18,19s3. J. w. w. DRY'SDALE Em. 1, 1

ELECTRICALLY DRIVEN ROTARY PUMP Filed July 30, 1931 7 Sheets-Sheet 7 1670: (9. Ha 9. MM

JohnWWDrysdale wohh )"om Patented July s, 1933 "UNITED-STATES JOHN wnrrnrrnan' ,wI 'soN SCOTLAND, ASSIGNOItS "1'0 GQW, soo'rLAnn PATENT OFFICE n Ec'rnrciiLLY-pmvEN ROTARY rum? Application aiea July so, ieanseriai No. 554,118; and in Great Britain m 27, 1931.

i This invention relates to pump units of the submersible air bell type as covered by our Patent;No.{138,753. Such pump units com-. prise a rotarypump with vertical axis of rtation,-an electric motor arranged above the pump and driving it, and a casing or bell whichenvelopes the motor. This casing or bell is open at the bottom but is otherwise completely closed. When the pump is submerged, the airin-the bell is compressed. The water rises. in the .bellbut not to the same heightza's the water level outside the bell due to the air pressure within the bell. The

bell iscarried down sufiiciently far below the motor to ens'urethat, when the pumpis submergedto the maximum depth for which it is designed or intended, the water level within the bellwill bebelow the bottom of the motor or such parts of the motoras are liable to be damaged by submergence.

With pumps of this type as heretofore constructed therehas notbeen, as far as we are aware, circulation, or adequate circulation, of air within the bell when the unit is submerged ieven when only in a lip-sealed condition. (By a lip-sealed condition is meant that the water level is just above the lower edge of the bell,thus isolating the interior of the bell.) The construction according to the present winvention provides for adequate circulation I of air within the bell not only when the unit is unsubmerged but also when it is submerged to any extent from the lip-sealed condition to the maximum.

:6 ;Further, with pumps of the type in question as heretofore constructed, as far as we are aware, the bell has been of cylindrical shape, that is, of uniform diameter. WVith submergence the pressure rises in the bell as mthe air within it is compressed, the pressure varying inversely as the volume as is well known.

By reducing the dimensions of the bell. in the upper portion-which represents the ul- M timate'container of the air-or increasin the dimensions in the lower part and so increasing the amount of imprisoned air, it results that, when the bell is submerged to the maximum, at greater air pressure is obtained for a given submergence. This is of great advantage as allowing of a greater submergence for a given depth of hell, or permitting of a less depth of bell for a given submergence. According to the present invention the bell is made with increased diametcror increased lateral dimensions at the lower end, with the consequence that the requisite volume of contained air is obtained with a reduced height of hell. According to the present invention moreover the bell is made to conform as far as possible to the shape of the enclosed parts especially at the top, thus reducing the volume at the upper part of the bell.

The invention will be made clear by ex amplesof construction and will be set forth definitely in the claim. 7

Of the accompanying drawings Figsl to 7 illustrate the carrying of the invention into effect with various forms of pump. Figs. 8 and 9 are diagrammatic: they have relation to air pressures and volumes.

Figs. 1, 2, and 3 illustrate a construction of pump according to the invention and formed with an enlarged lower end of bell. The arrows illustrate the air circulation. Fig. 1 shows the circulation when the pump is run ning in open air, that is, nonsubmerged. Fig. 2 illustrates the circulation when the unit is running lipsealed. Fig. 3 illustratesthe same when the unit is running under maximum submersion.

a is the bell. It is formed with an enlarged lower portion 6. This lower part may be circular, square, rectangular, elliptical, or otherwise shaped as may be found convenient.

0 is the electric motor. The bell fits closely round the motor. It will be noticed that the bell is formed at the top with a shoulder e and head-piece d, the object being to reduce the air volume at the top of the hell. 2 is the pump and s is a stool bolted to the pump and supporting the electric motor. f is the fan. It is on the electric motor spindle.

It will be seen that in the non-submerged position the circulation involves the complete a air is admitted at 71 between the stool and the bell. 

